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Voyage Revenues (Table) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues $ 306,996 $ 324,282
Time charters [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues 125,619 176,709
Voyage charters [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues 181,781 145,443
Pool revenues [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Voyage revenues $ (404) $ 2,130